Possibly, there are a number of variables involved. You started with a trec file (audio/video) and then separated this into two tracks (AVI video + WAV audio), correct?
1. You then deleted the a) trec original file OR b) the AVI video file?
2. Did you save it previously under a different name?
That's a start.
PS - There may still be a temporary file but I'd have to figure out the path to find it.